2 * Copyright (c) 2006 Oracle. All rights reserved.
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6 * General Public License (GPL) Version 2, available from the file
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15 * copyright notice, this list of conditions and the following
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23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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33 #include <linux/kernel.h>
36 #include <linux/if_arp.h>
37 #include <linux/jhash.h>
38 #include <linux/ratelimit.h>
41 #define BIND_HASH_SIZE 1024
42 static struct hlist_head bind_hash_table[BIND_HASH_SIZE];
43 static DEFINE_RWLOCK(rds_bind_lock);
45 static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
47 return bind_hash_table + (jhash_2words((u32)addr, (u32)port, 0) &
48 (BIND_HASH_SIZE - 1));
51 /* must hold either read or write lock (write lock for insert != NULL) */
52 static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
53 struct rds_sock *insert)
56 struct hlist_head *head = hash_to_bucket(addr, port);
58 u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port);
60 hlist_for_each_entry(rs, head, rs_bound_node) {
61 cmp = ((u64)be32_to_cpu(rs->rs_bound_addr) << 32) |
62 be16_to_cpu(rs->rs_bound_port);
72 * make sure our addr and port are set before
73 * we are added to the list.
75 insert->rs_bound_addr = addr;
76 insert->rs_bound_port = port;
77 rds_sock_addref(insert);
79 hlist_add_head(&insert->rs_bound_node, head);
85 * Return the rds_sock bound at the given local address.
87 * The rx path can race with rds_release. We notice if rds_release() has
88 * marked this socket and don't return a rs ref to the rx path.
90 struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
95 read_lock_irqsave(&rds_bind_lock, flags);
96 rs = rds_bind_lookup(addr, port, NULL);
97 read_unlock_irqrestore(&rds_bind_lock, flags);
99 if (rs && sock_flag(rds_rs_to_sk(rs), SOCK_DEAD)) {
104 rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
110 /* returns -ve errno or +ve port */
111 static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
114 int ret = -EADDRINUSE;
118 rover = be16_to_cpu(*port);
121 rover = max_t(u16, prandom_u32(), 2);
125 write_lock_irqsave(&rds_bind_lock, flags);
128 struct rds_sock *rrs;
131 rrs = rds_bind_lookup(addr, cpu_to_be16(rover), rs);
133 *port = rs->rs_bound_port;
135 rdsdebug("rs %p binding to %pI4:%d\n",
136 rs, &addr, (int)ntohs(*port));
141 } while (rover++ != last);
143 write_unlock_irqrestore(&rds_bind_lock, flags);
148 void rds_remove_bound(struct rds_sock *rs)
152 write_lock_irqsave(&rds_bind_lock, flags);
154 if (rs->rs_bound_addr) {
155 rdsdebug("rs %p unbinding from %pI4:%d\n",
156 rs, &rs->rs_bound_addr,
157 ntohs(rs->rs_bound_port));
159 hlist_del_init(&rs->rs_bound_node);
161 rs->rs_bound_addr = 0;
164 write_unlock_irqrestore(&rds_bind_lock, flags);
167 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
169 struct sock *sk = sock->sk;
170 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
171 struct rds_sock *rs = rds_sk_to_rs(sk);
172 struct rds_transport *trans;
177 if (addr_len != sizeof(struct sockaddr_in) ||
178 sin->sin_family != AF_INET ||
180 sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
185 ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port);
189 if (rs->rs_transport) { /* previously bound */
193 trans = rds_trans_get_preferred(sock_net(sock->sk),
194 sin->sin_addr.s_addr);
196 ret = -EADDRNOTAVAIL;
197 rds_remove_bound(rs);
198 printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, "
199 "load rds_tcp or rds_rdma?\n");
203 rs->rs_transport = trans;